Added a common js to be used across all versions of docs

Author: andyi2it

javascripts/common.js

@@ -0,0 +1,13 @@
+document.addEventListener('DOMContentLoaded', function(){
+    const node = document.querySelector('[data-md-component="announce"]');
+    var banner='';
+    banner+='       <aside class="md-banner">';
+    banner+='           <div class="md-banner__inner md-grid md-typeset">'
+    banner+='               <h1>';
+    banner+='                   A new user survey of KServe is available, <a href="https://kserve-survey.com/">Take Survey &gt;&gt;</a>';
+    banner+='               </h1>';
+    banner+='           </div>';
+    banner+='       </aside>';
+    node.innerHTML=banner;
+
+});